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Interior Gateway Routing Protocol
Last modified: Friday, February 13, 2004 

(n.) Abbreviated as IGRP, a proprietary network protocol, developed by Cisco Systems, designed to work on autonomous systems. IGRP is a distance-vector routing protocol, which means that each router sends all or a portion of its routing table in a routing message update at regular intervals to each of its neighboring routers. A router chooses the best path between a source and a destination. Since each path can comprise many links, the system needs a way to compare the links in order to find the best path. A system such as RIP uses only one criteria -- hops -- to determine the best path. IGRP uses five criteria to determine the best path: the link's speed, delay, packet size, loading and reliability. Network administrators can set the weighting factors for each of these metrics.

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For internet.com pages about Interior Gateway Routing Protocol . Also check out the following links!

Related Links

Understanding IGRP
A white paper from Cisco detailing IGRP.

related categories

Internet Protocols

Routing

related terms

DDR

Enhanced Interior Gateway Routing Protocol

hot potato routing

OSPF

router

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Routing Information Protocol

virtual router

VRRP


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